To effectively enhance the energy density and overall performance of electrochemical capacitors (ECs), a new strategy is demonstrated to increase both the intrinsic activity of the reaction sites and their density. Herein, nickel cobalt phosphides (NiCoP) with high activity and nickel cobalt hydroxides (NiCo‐OH) with good stability are purposely combined in a hierarchical cactus‐like structure. The hierarchical electrode integrates the advantages of 1D nanospines for effective charge transport, 2D nanoflakes for mechanical stability, and 3D carbon cloth substrate for flexibility. The NiCoP/NiCo‐OH 3D electrode delivers a high specific capacitance of ≈1100 F g⁻¹, which is around seven times higher than that of bare NiCo‐OH. It also possesses ≈90% capacitance retention after 1000 charge–discharge cycles. An asymmetric supercapacitor composed of NiCoP/NiCo‐OH cathode and metal–organic framework‐derived porous carbon anode achieves a specific capacitance of ≈100 F g⁻¹, high energy density of ≈34 Wh kg⁻¹, and excellent cycling stability. The cactus‐like NiCoP/NiCo‐OH 3D electrode presents a great potential for ECs and is promising for other functional applications such as catalysts and batteries.

中文翻译：

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具有可调节成分的仙人掌状NiCoP / NiCo-OH 3D架构，适用于高性能电化学电容器

为了有效地提高能量密度和电化学电容器（EC）的整体性能，一种新的策略被证明可以同时提高反应位点的固有活性和密度。在此，将具有高活性的磷化镍钴（NiCoP）和具有良好稳定性的氢氧化镍钴（NiCo-OH）故意组合成类似仙人掌的分层结构。分层电极整合了1D纳米脊柱（用于有效的电荷传输），2D纳米薄片（用于机械稳定性）和3D碳布基底（用于柔性）的优点。NiCoP / NiCo-OH 3D电极可提供≈1100F g ^-1的高比电容，这是裸NiCo-OH的7倍左右。在1000次充放电循环后，它还具有约90％的电容保持率。由NiCoP / NiCo-OH阴极和金属-有机骨架衍生的多孔碳阳极组成的不对称超级电容器可实现≈100F g ^-1的比电容，≈34Wh kg ^-1的高能量密度以及出色的循环稳定性。像仙人掌一样的NiCoP / NiCo-OH 3D电极为EC带来了巨大的潜力，并有望用于催化剂和电池等其他功能性应用。